Drill.



BENJAMIN KUNITZ, 0F BROOKLYN, NEW YORK, ASSIGNOR TO AMERICAN PKLASTER DRILL CO., IN C., OF BROOKLYN, NEW YORK, AV CORPORATION OF NEW YORK.

DRILL.

To all whom t may concern.'

Be it known that I, BENJAMIN KUNrrz, a subject of the Czar of Russia, residing at Brooklyn, in the county of Kings andvState of New York, have invented new and useful Improvements in Drills, of which the following is a specification.

This invention relates topdrill bits and it consists in the novel features hereinafter described and claimed.

The present invention is an improvement over the structure shown in my prior application for drill filed July 28, 1914, Serial No. 858,754 and similar to that of my priorl invention the obj ect of the present invention is to improve a drill bit especially adapted to be used by electricians when installing electric wires in buildings. These wires are generally passed through iron or metal pipes and at the point where the wires enter the room of a building the wall or' ceiling is provided with a socket to receive the outlet box. These boxes are usually flanged at their sides and in different styles or pat-` terns the ianges are not of the same diameter. The bit which forms the subject matter of the present invention not only provides means for cutting a socket adapted to receive the body of the box but'it also includes means for cutting an annular groove of any desired diameter adapted to receive the flange of the box. This socket may be cut in the wall notwithstanding the presence of the pipe in the wall where the socket is to be made.

Vith the above object in view the bit comprises a shank upon which is mounted a basin adapted to catch and retain the chips or material cut from the socket. A head is mounted upon the shank above the basin and may if desired be provided with a centering pin. One set of blades are fixedly mounted upon the head and radially disposed with relation to the same. Another set of blades are adjustably mounted upon the head and are disposed in lines parallel with the axis of the shank. The last mentioned blades may be adjusted toward or away from the axis of the shank and the last mentioned blades may also be adjusted in lines parallel with the axis of the shank and means are provided for securing the last mentioned blades at adjusted positions.

Specification of Letters Patent.

In the accompanying drawings Figure 1 is a side elevation of the drill blt with parts in section.

Fig. 2 is an end elevation of the head thereof.

Fig. 3 is an enlarged side elevation of the head thereof.

Fig. 4 is a detailed Vsectional view of a portion of the head cuton the line 4 4 of Fig. 3.

The drill bit comprises a shank 1 upon which is mounted a basin 2 adapted toV catch and retain the chips from the socket or the material out therefrom. A head 3 is mounted at the end of the shank 1 and blades 4 are secured upon the head 3 in xed positions the said blades having cutting edges which are disposed approximately radially with relation to the axis of the shank 1. The shank 1 may if desired be provided with a centering pin 5, however this pin is not absolutely essential and when the tool is used for cutting a socket about a pipe the said centering pin 5 may be detached or dispensed with. n

The head 3 is provided at points between the blades 4 with outstanding arms 6 provided at one side with recesses 7 best indicated in Fig. 4 of the drawing. The inner ends of brackets 8 are slidably received in the recesses 7 and the said brackets are provided with longitudinally disposed slots 9. Set screws 10 pass through the slots 9 and enter the arms 6 and serve as means for securing the brackets 8 at adjusted positions upon the said arms. It is apparent that by loosening the set screws 10 the brackets 8 may be adjusted longitudinally with relation to the arms 6 and when at desired positions may be secured by tightening the said set screws l0.

The brackets 8 are provided at their outer ends with recesses 11 in which are received blades or bits 12. Clamp plates 13 are secured at the outer portions of the brackets 8 by means of screws 14 or other suitable securing devices and the outer edge portions of the said clamp plates 13 bear against the sides of the bit 12 and hold the said bit in position in the recesses 11. Therefore it will be seen that by loosening the screws 14 the plates 13 may be moved away from the bits 12 and consequently the bits may Patented Aug. 11, 1917.

Application led November 27, 1914. y Serial No. 874,309. i

be moved longitudinally in the recesses 11 and adjusted in lines parallel With the axis oi' the shank 1.

From the above description taken in conjunction with the accompanying drawing it Will be observed that When the tool is used for cutting a socket in a Wall or ceiling the blades 4 Will remove the major portion of the material Jfrom the socket While the blades or bits 12 may be adjusted to cut an annular groove in the bottom ofl the socket. lt Will also be seen that by adjustingthe bit l2 the said groove may be of any desired diameter and any desired depth With relation to the bottom of the socket.

Having described the invention what is claimed is A tool comprising a head, a blade mounted thereon and having a cutting edge disposed approximately radially With relation to the Copies o this patent may be obtained for five cents each, by addressing the center of the head, a bracket mounted on the head. for adjust-ment radially thereof, and at its inner end terminating short of the center of the head, meansfor securing the bracket atranadjusted position on the head, a blade mounted on the said bracket for adjustment in a direction parallel with the axis of the head, and means for securing the last mentioned blade at an adjusted position on the bracket, the parts beingso arranged that the last mentioned blade may be positioned between the inner and outer ends of the path of movementV of the cutting edge of the iirst mentioned blade.

In testimony Whereol aiiiX myvsignature in presence of tWo Witnesses.

BENJAMIN KUNITZ. lVitnesse's:

JOHN` O. DoNneAvN, M. E. LAUGHLIN.

Commissioner of.' Patents.

Washington, D. O. 

